1. the state of being split or cleft - there was a cleavage between the liberal and conservative members • Hypernyms: state 2. the breaking of a chemical bond in a molecule resulting in smaller molecules • Hypernyms: chemical process, chemical change, chemical action 3.(embryology) the repeated division of a fertilised ovum • Syn: segmentation • Topics: embryology • Hypernyms: cell division, cellular division • Part Holonyms: pregnancy, gestation, maternity 4. the line formed by a groove between two parts (especially the separation between a woman's breasts) • Hypernyms: area, region 5. the act of cleaving or splitting • Derivationally related forms: cleave • Hypernyms: division